Share prices plunged again yesterday for publicly traded asset managers as the U.S. stock market suffered its worst single day decline since 1987. And the picture looks even worse year-over-year.

Martin L. FlanaganInvescoPresident and CEO

The S&P 500 fell 12 percent yesterday, again triggering the NYSE's circuit breaker at the beginning of the day. 20 publicly traded U.S. asset managers tracked by MFWire saw their shares fall an average of 12.3 percent.

The picture for those asset managers worsens as you widen the lens. Their shares are down 17.5 percent in a week (versus 13.1 percent for the S&P 500), 33 percent so far in March (versus 26 percent), 37.4 percent since the market's peak on February 19 (versus 29.5 percent), 32.3 percent year-to-date (versus 26.1 percent), and 24.1 percent year-over-year (versus 15.8 percent).

Only one asset manager, Legg Mason, is up so far in 2020 and in March, which makes sense given that it's being acquired in an all-cash deal that was unveiled on February 18 (the day before the market peaked).

Here are each of the 20 asset managers, ranked by their year-to-date share price performance:

Invesco (IVZ, $3.967 billion market cap), down 50.5 percent YTD and since the peak last month, 48.6 percent this month, 24.5 percent in the last seven days, and 19 percent yesterday;

WisdomTree (WETF, $384.835 million market cap), down 48.8 percent YTD, 49.6 percent since the peak, 41.2 percent this month, 24.8 percent in the last seven days, and 26.1 percent yesterday;